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Donald Trump and Kim Jong Un’s landmark summit on June 12 has spurred hope that North Korea may finally open its economy. That could also be a boon for economists, who know next to nothing about how it actually works.

North Korea stopped releasing detailed statistical data in the 1960s, and for the next four decades the only hard economic numbers came from limited revenue and spending figures in annual national budget reports. The government removed absolute numbers altogether in the early 2000s, and since then has only offered year-on-year percentage changes for various oddly described sectors. They look like this: